diff --git a/src/system/pointer/index.ts b/src/system/pointer/index.ts
index ba7158a2..ddbf190d 100644
--- a/src/system/pointer/index.ts
+++ b/src/system/pointer/index.ts
@@ -15,6 +15,7 @@ export class PointerHost {
     this.system = system
     this.buttons = new Buttons()
     this.mouse = new Mouse()
+    this.pointers.new('mouse', 'mouse', this.buttons)
   }
   private readonly mouse
   private readonly buttons
@@ -28,35 +29,32 @@ export class PointerHost {
   })()
 
   private readonly pointers = new (class {
-    private registry = {
-      mouse: new Pointer({
-        pointerId: 1,
-        pointerType: 'mouse',
-        isPrimary: true,
-      }),
-    } as Record<string, Pointer>
-    private nextId = 2
-
-    new(pointerName: string, keyDef: pointerKey) {
+    private registry: Record<string, Pointer> = {}
+    private nextId = 1
+
+    new(pointerName: string, pointerType: string, buttons: Buttons) {
       const isPrimary =
-        keyDef.pointerType !== 'touch' ||
+        pointerType !== 'touch' ||
         !Object.values(this.registry).some(
           p => p.pointerType === 'touch' && !p.isCancelled,
         )
 
       if (!isPrimary) {
         Object.values(this.registry).forEach(p => {
-          if (p.pointerType === keyDef.pointerType && !p.isCancelled) {
+          if (p.pointerType === pointerType && !p.isCancelled) {
             p.isMultitouch = true
           }
         })
       }
 
-      this.registry[pointerName] = new Pointer({
-        pointerId: this.nextId++,
-        pointerType: keyDef.pointerType,
-        isPrimary,
-      })
+      this.registry[pointerName] = new Pointer(
+        {
+          pointerId: this.nextId++,
+          pointerType,
+          isPrimary,
+        },
+        buttons,
+      )
 
       return this.registry[pointerName]
     }
@@ -84,10 +82,14 @@ export class PointerHost {
     keyDef: pointerKey,
     position: PointerPosition,
   ) {
+    this.devices.get(keyDef.pointerType).addPressed(keyDef)
+
+    this.buttons.down(keyDef)
+
     const pointerName = this.getPointerName(keyDef)
     const pointer =
       keyDef.pointerType === 'touch'
-        ? this.pointers.new(pointerName, keyDef).init(instance, position)
+        ? this.pointers.new(pointerName, keyDef.pointerType, this.buttons)
         : this.pointers.get(pointerName)
 
     // TODO: deprecate the following implicit setting of position
@@ -96,10 +98,11 @@ export class PointerHost {
       this.mouse.position = position
     }
 
-    this.devices.get(keyDef.pointerType).addPressed(keyDef)
+    if (pointer.pointerType === 'touch') {
+      pointer.init(instance)
+    }
 
-    this.buttons.down(keyDef)
-    pointer.down(instance, keyDef)
+    pointer.down(instance, keyDef.button)
 
     if (pointer.pointerType !== 'touch') {
       this.mouse.down(instance, keyDef, pointer.isPrevented)
@@ -152,7 +155,7 @@ export class PointerHost {
     }
 
     if (device.countPressed === 0) {
-      pointer.up(instance, keyDef)
+      pointer.up(instance, keyDef.button)
     }
 
     if (pointer.pointerType === 'touch') {
diff --git a/src/system/pointer/pointer.ts b/src/system/pointer/pointer.ts
index 8897d80c..feed1c37 100644
--- a/src/system/pointer/pointer.ts
+++ b/src/system/pointer/pointer.ts
@@ -1,6 +1,7 @@
 import {type Instance} from '../../setup'
 import {assertPointerEvents, getTreeDiff, hasPointerEvents} from '../../utils'
-import {isDifferentPointerPosition, pointerKey, PointerPosition} from './shared'
+import {isDifferentPointerPosition, PointerPosition} from './shared'
+import {Buttons, getMouseEventButton, MouseButton} from './buttons'
 
 type PointerInit = {
   pointerId: number
@@ -9,15 +10,20 @@ type PointerInit = {
 }
 
 export class Pointer {
-  constructor({pointerId, pointerType, isPrimary}: PointerInit) {
+  constructor(
+    {pointerId, pointerType, isPrimary}: PointerInit,
+    buttons: Buttons,
+  ) {
     this.pointerId = pointerId
     this.pointerType = pointerType
     this.isPrimary = isPrimary
     this.isMultitouch = !isPrimary
+    this.buttons = buttons
   }
   readonly pointerId: number
   readonly pointerType: string
   readonly isPrimary: boolean
+  readonly buttons: Buttons
 
   isMultitouch: boolean = false
   isCancelled: boolean = false
@@ -26,9 +32,7 @@ export class Pointer {
 
   position: PointerPosition = {}
 
-  init(instance: Instance, position: PointerPosition) {
-    this.position = position
-
+  init(instance: Instance) {
     const target = this.getTarget(instance)
     const [, enter] = getTreeDiff(null, target)
     const init = this.getEventInit()
@@ -53,7 +57,7 @@ export class Pointer {
 
     const nextTarget = this.getTarget(instance)
 
-    const init = this.getEventInit()
+    const init = this.getEventInit(-1)
 
     const [leave, enter] = getTreeDiff(prevTarget, nextTarget)
 
@@ -84,7 +88,7 @@ export class Pointer {
     }
   }
 
-  down(instance: Instance, _keyDef: pointerKey) {
+  down(instance: Instance, button: MouseButton = 0) {
     if (this.isDown) {
       return
     }
@@ -96,11 +100,11 @@ export class Pointer {
     this.isPrevented = !instance.dispatchUIEvent(
       target,
       'pointerdown',
-      this.getEventInit(),
+      this.getEventInit(button),
     )
   }
 
-  up(instance: Instance, _keyDef: pointerKey) {
+  up(instance: Instance, button: MouseButton = 0) {
     if (!this.isDown) {
       return
     }
@@ -110,7 +114,7 @@ export class Pointer {
 
     this.isPrevented = false
     this.isDown = false
-    instance.dispatchUIEvent(target, 'pointerup', this.getEventInit())
+    instance.dispatchUIEvent(target, 'pointerup', this.getEventInit(button))
   }
 
   release(instance: Instance) {
@@ -133,12 +137,22 @@ export class Pointer {
     return this.position.target ?? instance.config.document.body
   }
 
-  private getEventInit(): PointerEventInit {
+  private getEventInit(
+    /**
+     * The `button` that caused the event.
+     *
+     * This should be `-1` if the event is not caused by a button or touch/pen contact,
+     * e.g. a moving pointer.
+     */
+    button?: MouseButton,
+  ): PointerEventInit {
     return {
       ...this.position.coords,
       pointerId: this.pointerId,
       pointerType: this.pointerType,
       isPrimary: this.isPrimary,
+      button: getMouseEventButton(button),
+      buttons: this.buttons.getButtons(),
     }
   }
 }
diff --git a/tests/_helpers/listeners.ts b/tests/_helpers/listeners.ts
index a579b2f8..d8f6b136 100644
--- a/tests/_helpers/listeners.ts
+++ b/tests/_helpers/listeners.ts
@@ -100,7 +100,7 @@ export function addListeners(
       isMouseEvent(e)
         ? `${e.type} - button=${e.button}; buttons=${e.buttons}; detail=${e.detail}`
         : isPointerEvent(e)
-        ? `${e.type} - pointerId=${e.pointerId}; pointerType=${e.pointerType}; isPrimary=${e.isPrimary}`
+        ? `${e.type} - pointerId=${e.pointerId}; pointerType=${e.pointerType}; isPrimary=${e.isPrimary}; button=${e.button}; buttons=${e.buttons}`
         : e.type,
     )
     return {snapshot: lines.join('\n')}
diff --git a/tests/pointer/click.ts b/tests/pointer/click.ts
index fd337a86..44f0350a 100644
--- a/tests/pointer/click.ts
+++ b/tests/pointer/click.ts
@@ -5,9 +5,9 @@ test('click element', async () => {
   await user.pointer({keys: '[MouseLeft]', target: element})
 
   expect(getClickEventsSnapshot()).toMatchInlineSnapshot(`
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=1
     mousedown - button=0; buttons=1; detail=1
-    pointerup - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerup - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=0
     mouseup - button=0; buttons=0; detail=1
     click - button=0; buttons=0; detail=1
   `)
@@ -19,7 +19,7 @@ test('secondary button triggers contextmenu', async () => {
   await user.pointer({keys: '[MouseRight>]', target: element})
 
   expect(getClickEventsSnapshot()).toMatchInlineSnapshot(`
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=2; buttons=2
     mousedown - button=2; buttons=2; detail=1
     contextmenu - button=2; buttons=2; detail=0
   `)
@@ -33,14 +33,14 @@ test('double click', async () => {
   await user.pointer({keys: '[MouseLeft][MouseLeft]', target: element})
 
   expect(getClickEventsSnapshot()).toMatchInlineSnapshot(`
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=1
     mousedown - button=0; buttons=1; detail=1
-    pointerup - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerup - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=0
     mouseup - button=0; buttons=0; detail=1
     click - button=0; buttons=0; detail=1
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=1
     mousedown - button=0; buttons=1; detail=2
-    pointerup - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerup - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=0
     mouseup - button=0; buttons=0; detail=2
     click - button=0; buttons=0; detail=2
     dblclick - button=0; buttons=0; detail=2
@@ -89,14 +89,14 @@ test('two clicks', async () => {
   await user.pointer({keys: '[MouseLeft]'})
 
   expect(getClickEventsSnapshot()).toMatchInlineSnapshot(`
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=1
     mousedown - button=0; buttons=1; detail=1
-    pointerup - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerup - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=0
     mouseup - button=0; buttons=0; detail=1
     click - button=0; buttons=0; detail=1
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=1
     mousedown - button=0; buttons=1; detail=1
-    pointerup - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerup - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=0
     mouseup - button=0; buttons=0; detail=1
     click - button=0; buttons=0; detail=1
   `)
@@ -117,22 +117,22 @@ test('other keys reset click counter', async () => {
   })
 
   expect(getClickEventsSnapshot()).toMatchInlineSnapshot(`
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=1
     mousedown - button=0; buttons=1; detail=1
-    pointerup - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerup - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=0
     mouseup - button=0; buttons=0; detail=1
     click - button=0; buttons=0; detail=1
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=1
     mousedown - button=0; buttons=1; detail=2
     mousedown - button=2; buttons=3; detail=1
     contextmenu - button=2; buttons=3; detail=0
     mouseup - button=2; buttons=1; detail=1
     auxclick - button=2; buttons=1; detail=1
-    pointerup - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerup - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=0
     mouseup - button=0; buttons=0; detail=0
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=1
     mousedown - button=0; buttons=1; detail=1
-    pointerup - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerup - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=0
     mouseup - button=0; buttons=0; detail=1
     click - button=0; buttons=0; detail=1
   `)
@@ -148,12 +148,12 @@ test('click per touch device', async () => {
   await user.pointer({keys: '[TouchA]', target: element})
 
   expect(getClickEventsSnapshot()).toMatchInlineSnapshot(`
-    pointerover - pointerId=2; pointerType=touch; isPrimary=true
-    pointerenter - pointerId=2; pointerType=touch; isPrimary=true
-    pointerdown - pointerId=2; pointerType=touch; isPrimary=true
-    pointerup - pointerId=2; pointerType=touch; isPrimary=true
-    pointerout - pointerId=2; pointerType=touch; isPrimary=true
-    pointerleave - pointerId=2; pointerType=touch; isPrimary=true
+    pointerover - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerenter - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerdown - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerup - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=0
+    pointerout - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=0
+    pointerleave - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=0
     mouseover - button=0; buttons=0; detail=0
     mouseenter - button=0; buttons=0; detail=0
     mousemove - button=0; buttons=0; detail=0
@@ -172,24 +172,24 @@ test('double click per touch device', async () => {
   await user.pointer({keys: '[TouchA][TouchA]', target: element})
 
   expect(getClickEventsSnapshot()).toMatchInlineSnapshot(`
-    pointerover - pointerId=2; pointerType=touch; isPrimary=true
-    pointerenter - pointerId=2; pointerType=touch; isPrimary=true
-    pointerdown - pointerId=2; pointerType=touch; isPrimary=true
-    pointerup - pointerId=2; pointerType=touch; isPrimary=true
-    pointerout - pointerId=2; pointerType=touch; isPrimary=true
-    pointerleave - pointerId=2; pointerType=touch; isPrimary=true
+    pointerover - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerenter - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerdown - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerup - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=0
+    pointerout - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=0
+    pointerleave - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=0
     mouseover - button=0; buttons=0; detail=0
     mouseenter - button=0; buttons=0; detail=0
     mousemove - button=0; buttons=0; detail=0
     mousedown - button=0; buttons=1; detail=1
     mouseup - button=0; buttons=0; detail=1
     click - button=0; buttons=0; detail=1
-    pointerover - pointerId=3; pointerType=touch; isPrimary=true
-    pointerenter - pointerId=3; pointerType=touch; isPrimary=true
-    pointerdown - pointerId=3; pointerType=touch; isPrimary=true
-    pointerup - pointerId=3; pointerType=touch; isPrimary=true
-    pointerout - pointerId=3; pointerType=touch; isPrimary=true
-    pointerleave - pointerId=3; pointerType=touch; isPrimary=true
+    pointerover - pointerId=3; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerenter - pointerId=3; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerdown - pointerId=3; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerup - pointerId=3; pointerType=touch; isPrimary=true; button=0; buttons=0
+    pointerout - pointerId=3; pointerType=touch; isPrimary=true; button=0; buttons=0
+    pointerleave - pointerId=3; pointerType=touch; isPrimary=true; button=0; buttons=0
     mousedown - button=0; buttons=1; detail=2
     mouseup - button=0; buttons=0; detail=2
     click - button=0; buttons=0; detail=2
diff --git a/tests/pointer/drag.ts b/tests/pointer/drag.ts
index 232cdd50..818dcbe8 100644
--- a/tests/pointer/drag.ts
+++ b/tests/pointer/drag.ts
@@ -10,11 +10,11 @@ test('drag sequence', async () => {
   ])
 
   expect(getClickEventsSnapshot()).toMatchInlineSnapshot(`
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=1
     mousedown - button=0; buttons=1; detail=1
-    pointermove - pointerId=1; pointerType=mouse; isPrimary=true
+    pointermove - pointerId=1; pointerType=mouse; isPrimary=true; button=-1; buttons=1
     mousemove - button=0; buttons=1; detail=0
-    pointerup - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerup - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=0
     mouseup - button=0; buttons=0; detail=1
     click - button=0; buttons=0; detail=1
   `)
@@ -31,11 +31,11 @@ test('drag sequence w/ differing client coordinates', async () => {
   ])
 
   expect(getClickEventsSnapshot()).toMatchInlineSnapshot(`
-    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerdown - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=1
     mousedown - button=0; buttons=1; detail=1
-    pointermove - pointerId=1; pointerType=mouse; isPrimary=true
+    pointermove - pointerId=1; pointerType=mouse; isPrimary=true; button=-1; buttons=1
     mousemove - button=0; buttons=1; detail=0
-    pointerup - pointerId=1; pointerType=mouse; isPrimary=true
+    pointerup - pointerId=1; pointerType=mouse; isPrimary=true; button=0; buttons=0
     mouseup - button=0; buttons=0; detail=1
     click - button=0; buttons=0; detail=1
   `)
@@ -51,13 +51,13 @@ test('drag touch', async () => {
   ])
 
   expect(getClickEventsSnapshot()).toMatchInlineSnapshot(`
-    pointerover - pointerId=2; pointerType=touch; isPrimary=true
-    pointerenter - pointerId=2; pointerType=touch; isPrimary=true
-    pointerdown - pointerId=2; pointerType=touch; isPrimary=true
-    pointermove - pointerId=2; pointerType=touch; isPrimary=true
-    pointerup - pointerId=2; pointerType=touch; isPrimary=true
-    pointerout - pointerId=2; pointerType=touch; isPrimary=true
-    pointerleave - pointerId=2; pointerType=touch; isPrimary=true
+    pointerover - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerenter - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointerdown - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=1
+    pointermove - pointerId=2; pointerType=touch; isPrimary=true; button=-1; buttons=1
+    pointerup - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=0
+    pointerout - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=0
+    pointerleave - pointerId=2; pointerType=touch; isPrimary=true; button=0; buttons=0
     mouseover - button=0; buttons=0; detail=0
     mouseenter - button=0; buttons=0; detail=0
     mousemove - button=0; buttons=0; detail=0